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|Author(s):||Archita Hati; Craig W. Nelson; Corey A. Barnes; Danielle G. Lirette; Jason A. DeSalvo; David A. Howe;|
|Title:||Ultra-low noise regenerative frequency divider|
|Published:||November 11, 2012|
|Abstract:||We designed ultra-low noise regenerative divider-by-2 circuits that operate at input frequencies of 20 MHz and 10 MHz. We achieved residual output-referred single-sideband phase noise below -162 dBc/Hz at 10 Hz offset for a single divider at these frequencies. In order to measure such a low noise we also built a cross-spectrum measurement system that has a noise floor of -175 dBc/Hz at 10 Hz offset from a 5 MHz and 10 MHz carrier. The low noise of the divider and the measurement system are achieved by use of custom-built mixers/phase detectors that use 2N2222A bipolar junction transistors (BJTs) in a conventional double balanced diode ring.|
|Citation:||IEEE Transactions on Ultrasonics Ferroelectrics and Frequency Control|
|Pages:||pp. 2596 - 2598|
|Keywords:||Frequency synthesis,Mixer,Phase noise,Regenerative divider|